Hanalei Bay Beach, Kauai Hanalei Bay Beach – Image courtesy of www.hawaiitopten.com

Best time to visit Kauai

Balmy and warm all year round, anytime of year is a good time to visit Kauai.

However, for guaranteed dry and sunny conditions, it’s probably best to visit during summer from June to October when the average temperature is 27°C (81°F).

The hottest months are August and September, when temperatures may reach 32°C (90°F).

For outdoor activities, summer is best for both kayaking, when the sea is calmer, and hiking – the Kalalau Trail is quite slippery during the winter rains.


Kauai weather

The rainy season lasts from December to March, when you can expect slightly cooler temperatures and heavy rain in the mountains and short showers elsewhere. Most of Kauai's rainfall occurs at night.

Surf conditions are seasonal: the North Shore and Westside waters are typically calm from May to September, with high surf from October to April, but the South Shore and Eastside conditions are just the opposite.

Note: Hawaii is full of microclimates, given its many valleys, mountain peaks and coastal plains. The leeward sides (west and south coasts) of each island are usually hot and dry, while the windward sides (east and north coasts) are generally cooler and wet.


Seasons

High season: From mid-December through March or mid-April – expect to pay top dollar for accommodations, car rentals, and airfare.

Low season: For the best hotel rates and airfares, visit in spring from mid-April to mid-June and during autumn from September to mid-December.

Note: The last week in April and early May coincide with three major Japanese holidays.


Kauai – Monthly Weather

J F M A M J J A S O N D
Ave Temp (°C) 22 22 22 23 24 25 26 26 26 25 24 23
Ave High Temp (°C) 26 26 27 28 29 30 30 31 31 30 29 27
Ave Low Temp (°C) 17 17 18 18 19 20 21 21 21 20 19 18
Sunshine (Hrs daily) 6 7 7 7 8 8 8 9 8 7 6 5
Daylight (Hrs daily) 11 11 12 13 13 14 14 13 12 12 11 11
Comfort Level Low heat & humidity icon Low heat & humidity icon Moderately warm icon Moderately warm icon Moderately warm icon High heat & humidity icon High heat & humidity icon High heat & humidity icon High heat & humidity icon High heat & humidity icon Moderately warm icon Moderately warm icon
Ave Humidity (%) 80 77 76 77 75 76 75 76 77 77 80 80
UV Index 7 9 10 11 11 11 11 11 11 9 7 6
Days with some Rain 8 6 5 4 3 2 3 3 4 5 5 6
Ave Rainfall (mm) 95 60 60 32 26 10 12 17 22 57 65 105
Sea Temp (°C) 24 24 24 24 25 25 26 26 27 27 26 25
(Kaumakani, Kauai) J F M A M J J A S O N D

Note: Meteorological data is sourced from the United States National Oceanic and Atmospheric Administration (NOAA) and the World Meteorological Organization (WMO).


Latest update: Best time to visit Kauai: 31 May, 2020


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